Blue-gray to green-gray vat dyes.



pnrran snares rarnnn amea MAX HENRY ISLER, OF MANNHEIM, GERMANY,ASSIGNOR TO BADISCHE ANILIN & SODA FABRIK, OF LUDWIGSHAFEN-ON-THE-RHINE,GERMANY, A OORPORATION.

BLUE-GRAY TO GREEN-GRAY VAT DYES.

No Drawing.

To all whom it may concern:

Be it known that 1, MAX HENRY IsLER, citizen of the Swiss Republic,residing at Mannheim, Germany, have invented new and useful Improvementsin Blue-Gray to Green-Gray Vat Dyes, of which the following is aspecification.

I have discovered a new class of vat coloring matters of the anthraceneseries which dye cotton from blue-gray to green-gray shades of excellentfastness against the action of chlorin, and in addition possess thefollowing characteristics. They consist when dry of dark violet-blackpowders which are insoluble in. water and in dilute acids and alkalis,but are soluble in concentrated sulfuric acid giving dull violetsolutions, are soluble in nitrobenzene giving blue-green to red-violetsolutions, in quinolin giving green-blue to black-blue solutions. Withalkali hydrosulfite they yield blue vats.

- My new coloring matters can be obtained by treating nitro-, or amino-,derivatives of dibenzanthrone, (normal, or iso) which derivatives can beproduced as described in the specifications of Letters Patents No. 796,393 and No. 1,063,000 with one of the following reactive chlorids,namely aluminium chlorid, antimony pentachlorid, phosphorous trichloridand phosphorous pentachlorid, and I prefer to carry out the reaction inthe presence of nitrobenzene.

The following examples will serve to illustrate how some of my newcoloring matters 'can be obtained, but the invention is not confined tothese examples. The parts are by weight.

Example 1: Heat together, for a few hours, at from 180-185 G. 100 partsof nitro-dibenzanthrone, from 500 to 1000 parts of nitrobenzene and 100parts of aluminium chlorid, and then distil olf the nitrobenzene, forexample, byv means of steam. The coloring matter so obtained can eitherbe directly employed for dyeing, or it can be first dissolved inconcentrated sulfuric acid and. precipitated by means of water in orderto obtain it in a state of fine division. It yields a dull violetsolution in concentrated sulfuric acid, a red-violet solution innitrobenzene and a black-blue solution in quinolin. The colorSpecification of Letters Patent.

Patented Jan. 25, 1916.

of .the hydrosulfite vat is blue and this vat colors cotton blue shadeswhich, upon wash- 1ng, are changed into fast bluish-gray shades. If inthis example, the aluminium chlorid be replaced by the same quantity ofantimony pentachlorid, preferably While increasing the quantity ofnitrobenzene, a

' similar coloring matter is obtained.

Example 2: Treat 100 parts of aminodibenzanthrone (obtainable, forinstance, by reducing, with sodium sulfid, the nitro-dibenzanthrone usedaccording to the foregoing example) with 500 to 2000 parts ofnitrobenzene and 100 parts of aluminium chlorid, as described in theforegoing example. The coloring matter so obtained yields a dull violetsolution in concentrated sulfuric acid, a blue-green solution innitrobenzene and a green-blue solution in quinolin. With alkalinehydrosulfite it gives a blue vat which colors cotton blue shades which,upon washing, are converted into gray shades having a greenish tinge. Ifin this example, the aluminium chlorid be replaced by. the same quantityof antimonythe corresponding derivatives of dibenzanthrone.

Now what I claim is l 1. The new coloring matters of the anthraceneseries which are derivatives of a dibenzanthrone and which consist whendry of dark violet-black powders, are insoluble in water and in diluteacids and alkalis, yield dull violet solutions in concentrated sul uricacid, are soluble in nitrobenzene giving bluegreen to red-violetsolutions and in quinolin yielding green-blue to black-blue solutions.

and dissolve in alkaline hydrosulfite solution yielding blue vats whichdye cotton from blue-gray to green-gray shades of excellent fastnessagainst the action of chlorin.

Q m s s 2. The new coloring matter of the anthradyes cotton bluish-grayshades of excellent 10 cene series which is a derivative of adibenfastness against the action of chlorin. v zant-hrone and whichconsists when dry of a In testimony whereof I have hereunto set darkpowder, is insoluble in water and in my hand in the presence of twosubscribing dilute acids and alkalis, yields a dull violet. witnesses.

solution in concentrated sulfuric acid, a red MAX HENRY ISLER. violetsolution in nitrobenzene, a black-blue Witnesses: solution in quinolin,and dissolves in alka- S. S. BERGER,

line hydrosulfite giving a blue vat which 1; Anne. LLOYD.

